ALL TANTALUM STOPPED FLOW DIFFERENTIAL MICRO-CALORIMETER

基于最近用于批量生产的传感器设计技术， 微量热计，我们设计了一个全钽停止流 灵敏度高得多、响应快得多的量热计 次 钽流量组件由两个入口管和一个 电子束焊接到钽混合器的出口管。 阵列 小型，快速响应热电堆位于相对两侧的 出口管 出口管包含350微升的体积。 一 0.1 mm不锈钢丝也连接到出口管，用于 校准 在此差速器中使用了两个这样的总成 仪器 管道的传感部分安装在一个大的热 并保持在热量计的核心或工作温度。 作为 管进入和离开散热器，它们被路由在一起， 沿管向下传播的热伪影将表现为共模， 而不是差分信号。 所得到的仪器灵敏度为1 焦耳/伏特 * 秒和48秒的10至90%阶跃响应。

Based upon the sensor design techniques recently used in batch micro-calorimeters, we have devised an all tantalum stopped flow calorimeter with significantly greater sensitivity and faster response times. The tantalum flow assembly consists of two inlet tubes and one outlet tube which are electron-beam welded to a tantalum mixer. An array of small, fast response thermopiles are located on opposite sides of the outlet tube. The outlet tube contains a volume of 350 micro-liters. A 0.1 mm stainless wire is also attached to the outlet tube for use in calibration. Two such assemblies are used in this differential instrument. The sensing portion of the tubing is mounted in a large heat sink and kept at the core or operating temperature of the calorimeter. As the tubes enter and leave the heat sink, they are routed together so that thermal artifacts propagating down the tubes will appear as common-mode and not differential signals. The resulting instrument has a sensitivity of 1 joule/volt*second and a 10 to 90% step response of 48 seconds.